| /* |
| * Copyright 2000-2009 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.intellij.util.text; |
| |
| import org.jetbrains.annotations.NotNull; |
| |
| public class CharSequenceSubSequence implements CharSequence, CharArrayExternalizable { |
| private final CharSequence myChars; |
| private final int myStart; |
| private final int myEnd; |
| |
| public CharSequenceSubSequence(@NotNull CharSequence chars) { |
| this(chars, 0, chars.length()); |
| } |
| |
| public CharSequenceSubSequence(@NotNull CharSequence chars, int start, int end) { |
| if (start < 0 || end > chars.length() || start > end) { |
| throw new IndexOutOfBoundsException("chars sequence.length:" + chars.length() + |
| ", start:" + start + |
| ", end:" + end); |
| } |
| myChars = chars; |
| myStart = start; |
| myEnd = end; |
| } |
| |
| @Override |
| public final int length() { |
| return myEnd - myStart; |
| } |
| |
| @Override |
| public final char charAt(int index) { |
| return myChars.charAt(index + myStart); |
| } |
| |
| @Override |
| public CharSequence subSequence(int start, int end) { |
| if (start == myStart && end == myEnd) return this; |
| return new CharSequenceSubSequence(myChars, myStart + start, myStart + end); |
| } |
| |
| @NotNull |
| public String toString() { |
| if (myChars instanceof String) return ((String)myChars).substring(myStart, myEnd); |
| return StringFactory.createShared(CharArrayUtil.fromSequence(myChars, myStart, myEnd)); |
| } |
| |
| public CharSequence getBaseSequence() { |
| return myChars; |
| } |
| |
| @Override |
| public void getChars(int start, int end, @NotNull char[] dest, int destPos) { |
| assert end - start <= myEnd - myStart; |
| CharArrayUtil.getChars(myChars, dest, start + myStart, destPos, end - start); |
| } |
| } |